The 26-year-old Belgium defender, who last season led City to their first top-flight crown since 1968, was delighted to commit his long-term future to the club.
He told www.mcfc.co.uk: "For me if you are good somewhere then there is no reason to look elsewhere. Man City as a project is not just a project of the owners or the people employed by the club; it is also my project."
He added: "I have been here since the beginning and I have seen everything at the club change inside and out. I have the feeling that I have contributed to it too. It is good to know that I can be at City for another six years. It is a compliment that the club feels so highly of me."
Kompany has established himself as a key figure for Roberto Mancini's side since arriving at the club from Hamburg in 2008.
He was a key figure last term and was one of four City players included in the Professional Footballers' Association's team of the year, along with England goalkeeper Joe Hart and midfielders Yaya Toure and David Silva.
Kompany, who also lifted the FA Cup in 2011, has already set his sights on more silverware.
"Our title win was amazing and one of the best feelings ever for us and the fans," he said. "That last game against QPR will be a very special part of City's history for the next 50 or 100 years but now is the time to look forward.
"Now I just want to move on. I have travelled a lot this summer all over the world and our story has been a big story everywhere.
"We have laid the foundations and now we want to win more. If we do that then we can be one of the most successful clubs for a long time to come and that is the aim."
Source: PA
Source: PA